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I got this setup from a buddy a few days ago. What are these springs about? I see 928 international does not seem to offer these any more...were there rears available as well? Is there a compatible rear set available now? What rates were these front ones? Thanks all.
Is there a modern eibach equivalent? rears or full sets? Where would these rates fall into the Stock/ street upgrade/ race spectrum?
The Eibach spring package was developed as a dual purpose street/track package. As with any jack of all trades it can never be a master of both but is a damn good approach to both. With the stock suspension on my late 90S4 I found it somewhat ponderous- presumably Porsche reckoned that lard asses and dentist's wives were more important than hard core drivers needs. The Eibach package got rid of that ponderous feel and gave the car the kind of edge I rather hoped it would have.
The package was developed by Kim Crumb in conjunction with Eibach and I assume that is the one and only package Eibach developed for the 928. For sure it is a firm ride but it is still relatively comfortable compared to an out and out track derived suspension package that typically are horrible for street driven machines. Of course what one person is happy with can be completely different to the next person but then I have always liked stiff suspensions on my cars and motorcycles. As I have aged the suspension feels a tad harsher than it first did but then 20 years ago I did not have a wrecked S4 and a fractured L1 vertebra in my past!
I agree with FredR.
I have these same 928 International springs with Bilsteins on my S4 and I like them. I was a bi t apprehensive to install it as so many people complained on the stiff and being bone jarring unpleasant. I find them perfect for a street car and even in Houston with its concrete roads, multitude of expansion joints and deteriorated surfaces its a nice set-up.
No regrets!
Deciding on a set of springs in a vacuum is tough. Wheels, wheel offset or spacers, and tires play a huge part in the handling and ride quality discussion, and both of those terms are subjective at best. The "touring" ride i enjoy is nothing at all like the "it must be handling well because my fillings fell out" that some equate with a good 928 package.
I found the eibach package a bit too harsh with new Boge dampers, even with just 17" wheels and Michelin Pilots. Both the car and I were too rattely. I swapped two out for factory 'sport' springs and found a compromise I like. It's all very subjective.
Adam, I helped install that same setup on a 86 clinic car, and it was back the next month to swap for a more compliant ride. At this point I don't bother suggesting that this or that setup will produce this or that result. Mostly because there's a lot of room for interpretation of this or that result.
Adam, I helped install that same setup on a 86 clinic car, and it was back the next month to swap for a more compliant ride. At this point I don't bother suggesting that this or that setup will produce this or that result. Mostly because there's a lot of room for interpretation of this or that result.
I was wondering the same thing, 170 to 300 _base_ lb/in in the rear with a ramp to 500, cant much move the rear at all on anything on the road. It would take a LOT of energy to compress that...and a big shock absorber.
I like the 170 that became a 190ish, and IMHO it can still be a GT car with up to a 250, tops.
I remember when Car & Driver reviewed the 928GT back in 1990 and called the ride jaw jarring harsh on the northern roads. Driving my friends new GT in Saudi back in the same time frame always felt comfortable yet precise and loved the way the car drove and handled. Tight yet just right.
With time... i ended up buying a set of B/E from 928Intl but never got to install them due to fear it might be too harsh per some feedback. I settled for the CS springs and Boge red shocks which to me mated with the stock 16” tires are a very good ride all around. The CS springs are NLA for now, so your options are standard S4 springs with Boge reds for a factory (North American) spec or Koni or Bilstein to make it harder. The 17” will make the ride stiffer on its own, then again like Dr. Bob mentioned every change makes an impact.
Adam, I helped install that same setup on a 86 clinic car, and it was back the next month to swap for a more compliant ride. At this point I don't bother suggesting that this or that setup will produce this or that result. Mostly because there's a lot of room for interpretation of this or that result.
Yes, it's all subjective. But I'm clearly on the end of the spectrum that likes it stiff (no jokes fellas), I daily drive a Golf R and feel like its a very compliant ride, even too soft, while many say its too jarring. I don't remember the spring rates on the ones I installed on the 89S4, were they all the same, or did they come in different rates?
Last edited by Adamant1971; 09-02-2020 at 11:24 PM.
Reason: added model
Stiffer springs in back do a lot to manage body roll, improving grip in front. When you spec springs and shocks, the multiplier changes with spacers and wheel offset, so a set you love with negative offset might be way too soggy with spacers. More bushing deflection too as wheels move out further from the control arm pivots.
Someplace I have a spring and force model I wrote for something. It was in the 16-bit era, before PC's and Lotus 1-2-3.
08-31-2020, 12:13 PM
Tell me about these front springs
